Q. Molar conductivities (Λ°m) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. Λ°m for CH₃COOH will be
A) 425.5 S cm² mol⁻¹
B) 180.5 S cm² mol⁻¹
C) 290.8 S cm² mol⁻¹
D) 390.5 S cm² mol⁻¹
Explanation
[Solution from source] By Kohlrausch's law, Λ°(CH₃COOH) = Λ°(CH₃COONa) + Λ°(HCl) − Λ°(NaCl) = 91.0 + 425.9 − 126.4 = 390.5 S cm² mol⁻¹. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.